Subject: [syzbot] [fscrypt?] WARNING in fscrypt_fname_siphash

From: syzbot <[email-masked]>
Date: Wed, 29 May 2024 13:41:19 -0700

Hello,

syzbot found the following issue on:

HEAD commit:    74eca356f6d4 Merge tag 'ceph-for-6.10-rc1' of https://gith..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15460752980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ee7b962709a5f5a5
dashboard link: https://syzkaller.appspot.com/bug?extid=340581ba9dceb7e06fb3
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15da8cd8980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14111972980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a5f8df213fa4/disk-74eca356.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/864334770567/vmlinux-74eca356.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b30965ded6d8/bzImage-74eca356.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/b77754f322c2/mount_0.gz

The issue was bisected to:

commit f9006acc8dfe59e25aa75729728ac57a8d84fc32
Author: Florian Westphal <[email-masked]>
Date:   Wed Apr 21 07:51:08 2021 +0000

    netfilter: arp_tables: pass table pointer via nf_hook_ops

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12dc9ee8980000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=11dc9ee8980000
console output: https://syzkaller.appspot.com/x/log.txt?x=16dc9ee8980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email-masked]
Fixes: f9006acc8dfe ("netfilter: arp_tables: pass table pointer via nf_hook_ops")

EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
fscrypt: AES-256-CBC-CTS using implementation "cts-cbc-aes-aesni"
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5079 at fs/crypto/fname.c:567 fscrypt_fname_siphash+0xc2/0x100 fs/crypto/fname.c:567
Modules linked in:
CPU: 1 PID: 5079 Comm: syz-executor422 Not tainted 6.9.0-syzkaller-12358-g74eca356f6d4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:fscrypt_fname_siphash+0xc2/0x100 fs/crypto/fname.c:567
Code: 0f b6 04 28 84 c0 75 3d 41 8b 34 24 49 83 c6 40 4c 89 ff 4c 89 f2 5b 41 5c 41 5d 41 5e 41 5f e9 b4 97 52 09 e8 3f 7a 72 ff 90 <0f> 0b 90 eb a8 89 d9 80 e1 07 38 c1 7c 86 48 89 df e8 d8 f0 d4 ff
RSP: 0018:ffffc90003c7f430 EFLAGS: 00010293
RAX: ffffffff822399b1 RBX: 0000000000000000 RCX: ffff888022a61e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003c7f5f0 R08: ffffffff82239955 R09: ffffffff82541c38
R10: 0000000000000007 R11: ffff888022a61e00 R12: ffffc90003c7f580
R13: dffffc0000000000 R14: ffff88807fcb3000 R15: ffff88807fd0b4b0
FS:  000055558ddca380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000045ede0 CR3: 0000000074e92000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __ext4fs_dirhash+0x3db/0x1530 fs/ext4/hash.c:268
 ext4fs_dirhash+0x193/0x320 fs/ext4/hash.c:322
 htree_dirblock_to_tree+0x727/0x10e0 fs/ext4/namei.c:1124
 ext4_htree_fill_tree+0x744/0x1400 fs/ext4/namei.c:1219
 ext4_dx_readdir fs/ext4/dir.c:597 [inline]
 ext4_readdir+0x2b1c/0x3500 fs/ext4/dir.c:142
 iterate_dir+0x65e/0x820 fs/readdir.c:110
 __do_sys_getdents64 fs/readdir.c:409 [inline]
 __se_sys_getdents64+0x20d/0x4f0 fs/readdir.c:394
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f91a3441b99
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd41154a58 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 6f72746e6f632f2e RCX: 00007f91a3441b99
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f91a34b55f0 R08: 000055558ddcb4c0 R09: 000055558ddcb4c0
R10: 000055558ddcb4c0 R11: 0000000000000246 R12: 00007ffd41154a80
R13: 00007ffd41154ca8 R14: 431bde82d7b634db R15: 00007f91a348a03b
 </TASK>

---
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